Pneumatic action.



G. P. BRAND.

PNEUMATIC ACTION.

APPLICATION FILED DEC. 26, 1913.

1,1 33,257. atent Mar. 30, 1915.

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J; W M OWW mwm THE Nm 5u PETERS 60.. FHOTOJJTHO, WASHINGTON D.

UNITED STATES PATENT OFFICE.

GEORGE r. BRAND, or NEW YORK, N. Y.

PNEUMATIC ACTION.

Application filed December 26, 1913.

T all whom it may concern:

Be it known that I, GEORGE P. BRAND, a citizen of the United States of America, and resident of New York, county of New York, and State of New York, have invented certain new and useful Improvements in Pneumatic Actions, of which the following is a specification.

This invention relates to improvements in pneumatic actions. In actions known as double valve actions, it has heretofore been customary to use valves with soft leather and felt to make an action noiseless as much as possible, as the seating of the valves from one seat to the other has a tendency to make a noise and by the employment of soft materials to prevent such noise, the efficiency of the action in power and repetition has been greatly reduced, whereas by the employment of hard valves and seats the efficiency is greatly increased, but the noise would be too great. To overcome this objection I employ a novel construction of primary valves and ports. I employ a primary valve covering two ports, one port leading into the opening into the passage leading to the secondary diaphragm and the other port leading into the passage that leads into the exhaust chamber. Between the two passages into which the two ports lead is a restricted passage very much smaller than either of the two ports.

The larger port on which the primary valve seats on the outside which is known as the atmosphere valve, is left large in proportion to the other one so that the atmosphere will return the valve with greater rapidity, than if it were constructed of the same size as the small one. On the other end of this large passage which has the atmosphere port is the exhaust port which is controlled by another valve in the exhaust chamber. I employ for illustration the secondary valves which are known as solid valves with one face of the valves glued to a piece of leather covering the valve port and the top end of said strip is glued to the face of the. valve board. Consequently, this strip supports the valve carry ing the valve stem and bumper secured thereto. The opposite face of the valve has another piece of leather glued to the same for controlling the other port of the valve chamber. These two leathers are compara- Specification of Letters Patent.

Patented Mar. 30, 1915.

Serial No. 808,864.

tively hard leather to reduce as much as possible the lost motion and sponginess in the parts in the movement from one port to the other.

Another object is to employ a simple and inexpensive, yet efiicient, valve seat which is formed in the face of the valve board and a part thereof.

Other objects and advantages of the invention will hereinafter appear and the novel features thereof will be particularly pointed out in the appended claims.

In single actions, it is necessary, to obtain satisfactory results, to employ hard valves, as with hard valves used in a single action less valve noise is obtained than in double actions with soft valves, but the repetition is not quite so satisfactory as the air admitted through the tracker bar is comparatively very little and as a bleed has to be employed to equalize the tension in the passages leading from the tracker bar to the diaphragm, it necessarily reduces the delicacy of attack when the pneumatic is caused to operate when the tracker bar opening is uncovered by the note sheet.

My invention is a combination between a single action and a double action where I admit air into the passages leading into the diaphragm and cut off the bleed or re stricted passage leading to the exhaust chamber, through the medium of a valve controlling ports, the air being returned through a restricted passage which produces the same result as the bleed in the single action. By my present invention I cut ofl this bleed when the atmosphere is admitted into the passages leading to the diaphragm, giving greater delicacy than could possibly be obtained with a single action and giving the same return and quietness of the valves that is obtained in a single action.

The invention is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which Figure 1 is a vertical transverse section through the action with the pneumatics shown in elevation. Fig. 2 is an enlarged detail in elevation looking in the direction of the arrows on the line 22 in Fig. 1.

Like numerals of reference indicate like parts throughout the different views.

5 4 is the exhaust chamber in which are the diaphragms 5. Beneath each diaphragm there is an individual diaphragmphamber 6, as seen in Fig. 1, with each of which communicates a passage 7 bored in the diaphragm board 8 and communicating withthe passage 9 in the detachable tube-supporting bar 10, with which passages 9 connect the tubes 11 leading to the tracker bar. From each passage 9 there is a bleed 12 opening into the exhaust chamber 13, which, in turn, communicates with the exhaust chamber 4, through a passage 14, indicated in dotted lines at the right of Fig. 1, it being understood that the exhaust chamber 4 in the primary chest and the exhaust chamber 13 both extend uninterruptedly throughout the length of the action. The bleed cap 15 is detachably secured to the tube-supporting bar 10 by screws or the like 16, so as to permit of ready removal thereof to permit access to the bleeds. In the diaphragm board 8 are the passages 17 leading from the exhaust chamber 4 downwardly and thence horizontally, as seen at 18, where they communicate with the vertical passages 19 in the secondary exhaust chest 20.

21 are the primary valves located in the atmosphere chamber 3 having its end 21 glued or otherwise secured at one end'and the other end serving to close the port 22 extending vertically through the valve board 23 and communicating with the exhaust chamber 4 through the port 24. This valve also serves to close a smaller port 25 independent of the port 22 communicating with the lateral passage 26 in the valve board. 7

27 is a restricted passage affording communication between the passage 26 and the port 22 and thence through the port 24 to the exhaust chamber 4. r

28 is a primary valve situated in the exhaust chamber 4 and cocperating with the diaphragm 5, as is usual, and serves to open or close the port 24. The stem 29 is carried by the valve 21 and cooperates with the valve 28.

The passage 26 connectsby passage 30 in the member 31 which, in turn, communicates with the passage 32 in the diaphragm board 33. Each passage 32 commimicates with the cup 34 carrying the diaphragm 35 and disposed in the exhaust chest 36, with which exhaust chamber 36 the passages 19 also 6.0 connect, as seen in Fig. 1.

37 is a support for the pneumatics having an opening38 for each pneumatic 39, the openings 38 registering with the openings 40 in said pneumatics. Each passage 40 connects by passage 41 with a valve chamber 42 in the valve chamber board 43, in which chamber42 is an opening 44 to the atmosphere.

45 is a secondary valve in the chamber 42, This valve has one face, as 46, glued to a strip of leather 47 said strips being glued at one end to the face of the valve board. This strip of leather thus supports the valve, which latter carries the valve stem 48 and the bumper 49, which latter cooperates with the diaphragm 35. The valve is provided upon its other face with a piece of leather 50. p 7

With the parts constructed and arranged as herein before described, the operation, which will be apparent from the drawings, briefly stated, is as follows. Upon admitting atmospheric air to the tube 11 from the tracker-bar and through the passages 9 and 7 behind the diaphragm 5, the valve 28 is forced to its seat, closing the port 24 and opening the valve 21, admitting atmospheric air through the space 3 into the port 25 and through the passages 26, 30 and 32 against the diaphragm 35, thereby forcing the valve 45 from its seat, closing the atmospheric port 44, putting the pneumatic 39 in communication with the exhaust tension through the chamber 42 and ports 41, 38 and 40, thereby collapsing the pneumatic 39. lVhenentrance to the tube 11 is closed by the imperforate portion of the music sheet passing over the tracker bar, the bleed 12 serves to equalize the tension in the passages 9 and 7 and in the chamber 21 behind the diaphragm 5. Atmospheric pressure then forces the valve 21 to its seat, and, consequently, the valve 28 from its seat, thus putting the interior of the cup 34 carrying the diaphragm 35 in communication with the exhaust chamber 4 through the restricted passage 27, causing the atmospheric pressure to close the valve 45 over the port forcing the diaphragm 35 back to its normal position with reduced rapidity, owing to the retardation of the return of the diaphragm 35 to its normal position.

Modifications in details may be resorted to without departing from the spirit of the invention or. sacrificing any of its advanta 'es.

lVhat is claimed as new is 1. In a pneumatic action, a primary flap valve, a plurality of ports across which said valve extends and covered thereby, and a bleed affording a restricted communication between said ports.

2. In a pneumatic action, a primary flap valve, a plurality of ports across which said valve extends and covered simultaneously by said valve, and a bleed affording a restricted communication between said ports.

3. In a pneumatic action, a primary flap valve, a plurality of ports across which said valve extends and covered simultaneously by said valve, and a bleed providing a restricted communication between said ports, said ports being of different area.

4. In a pneumatic action, a primary flap valve, a plurality of ports across which said valve extends and covered simultaneously by said valve, and a bleed providing a re stricted communication between said ports, said ports being of diiierent area and said restricted communication being of less area than the smaller of said ports.

5. In a pneumatic action, a flap valve, a plurality of ports of different area adapted to be closed simultaneously by said valve, there being a bleed providing a restricted passage of less area than the smaller port and affording communication between said ports, and an exhaust duct from the larger ort.

p 6. In a pneumatic action, a flap valve, a plurality of ports of different area adapted to be closed simultaneously by said valve, there being a bleed providing a restricted passage of less area than the smaller port and affording communication between said ports, said smaller port from the larger port, and a valve controlling said exhaust port.

7 In a pneumatic action, a valve chest, a secondary valve therein, a primary valve chest having a plurality of ports of different area, a primary valve for simultaneously closing said ports, and means for restricting flow of air from under the diaphragm of the primary valve through the larger of said ports.

8. In a pneumatic action, a secondary valve, a diaphragm operating said valve, means for admitting air to said diaphragm through a plurality of ports of different area, and means resticting escape of the air from under the same.

9. In a pneumatic action, a secondary valve provided with a diaphragm, means for admitting atmospheric air under said diaphragm through a plurality of ports, and means for restricting escape of such air to one of said ports only.

10. In a pneumatic action, a secondary valve provided with a diaphragm, means for admitting atmospheric air under said diaphragm through a plurality of ports, means for restricting escape of such air to one of said ports only, and an exhaust chamber with which said restricted port communicates.

11. In a pneumatic action, a secondary valve provided with a diaphragm, means for admitting atmospheric air under said diaphragm through a plurality of ports, means for restricting escape of such air to one of said ports only, an exhaust chamber with which said restricted port communicates, and means interposed between said exhaust chamber and the larger of said ports to close the passage through the larger of said ports.

12. In a pneumatic action, a diaphragm, a passage in communication therewith, a restricted passage communicating with the exhaust, and means controlling both of said passages, and means for cutting 011? said communication with the exhaust.

13. In a pneumatic action, two exhaust chambers, a primary valve, a diaphragm, a plurality of passages for admitting air behind the diaphragm and simultaneously closing the said valve, and means for egress of the air with less rapidity than it enters behind said diaphragm.

14. In a pneumatic action, a diaphragm, a plurality of ports of different area, a primary valve simultaneously covering both of said ports, and means admitting air behind said diaphragm through both of said ports when said valve is open and for restricted outflow of the air from behind said diaphragm, through one only of said ports, when said valve is closed.

15. In a pneumatic action, a diaphragm, a plurality of ports of different area, a primary valve simultaneously covering both of said ports, and means admitting air behind said diaphragm through both of said ports when said "aly e is open and for restricted outflow of the air from behind said diaphragm, through one only of said ports, when said valve is closed, through said port to an exhaust chamber.

16. In a pneumatic action, a diaphragm, a plurality of ports of different area, a primary valve simultaneously covering both of said ports, a restricted passage in communication with both of said ports, an exhaust port in communication with the larger of said ports, and a valve for said exhaust port and cooperating with said diaphragm.

17. In a pneumatic action, a member having an inflation port and a secondary port, a diaphragm, a passage leading thereto in communication with said inflation port through a restricted port, said secondary port being in communication with said passage, and a valve for closing said ports simultaneously.

18. In a pneumatic action, a member having a port, and a smaller independent port, a diaphragm, a passage leading thereto from said smaller port, there being a bleed afi'0rding communication between said passage and the firstnamed port, said passage communicating with the exhaust through said bleed and communicating with the atmosphere through said smaller port.

19. In a pneumatic action, a member having a plurality of ports, a diaphragm, a passage leading thereto from said smaller port, there being a bleed affording communication between said passage and one of said ports, said passage communicating with the exhaust through said bleed and communicating with the atmosphere through said smaller port, and valves for said ports.

valve for said ports, and a diaphragm for operating said valve.

Signed by me at Washington, D. (3., this 20th day of December, 1913.

GEORGE P. BRAND. Vitnesses E. H. BOND, J OHN SORIVENER.

20. In a pneumatic action, a member having a plurality of ports, a diaphragm, a passage leading thereto from said smaller port, there being a bleed afiording communication 5 between said passage and one of said ports, said passage communicating with the exhaust through 'saidbleed and communicating with the atmosphere through said smaller port, a

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I 

